SLOTH BEAR 443 and the Thibetan Blue Bear (U~. jpruinosus) are distinct species, not to be confounded with U. aretos. Neither, of course, are the Peruvian U. ornatus and the Sun Bear, 17. rnalayanus. The Polar Bear has even been placed in a separate genus, Thalassarctos, a proceeding which is quite unnecessary* The white colour of this Bear tends to become browner with age. It is one of the few mammals which extend right round the pole; the Polar Bear is of course a purely Arctic animal. The chief food of the Polar Bear is Seal. Out of thirty Bears examined, Mr. Jb'iu. *2'2Z>.ŚMalayan Bear. T7r$tt$ malayanus. x j'o. Koettlitz found that only fifteen had animal remains in their stomachs, and these remains were invariably SeaL The animal apparently hunts by scent rather than by sight or hearing, both of which senses seem to be somewhat dull. The males and females wander separately, except of course during the breeding season. The Bears dig holes in which they may remain for some time, but there is no hibernation. In Pleistocene times, the Polar Bear extended as far south as Hamburg. The female has four mammae, pectoral in position. Melnrs-iis includes only M. lahiat-us, the Sloth Bear of India. This animal has an upturned snout, which is described as closely resembling that of JHfydaits, the Teledu. The snout has no groove.